Amoxicillin is a semisynthetic antibiotic with a broad spectrum of activity. Amoxicillin is prescribed by veterinarians for the treatment of bacterial infections found in cats and dogs. Amoxicillin kills bacteria by disrupting the formation of their cell walls. Amoxicillin is more resistant to stomach acids, which allows better and more accurate absorption than other antibiotics. Amoxicillin is effective against ear infections, urinary tract infections, upper respiratory tract infections, skin infections, and dental infections in cats and dogs. Amoxicillin should only be used for bacterial infections and not viral or parasitic infections.